I'm pretty sure that will only fit the XJ6. It's not a replacement cowl like what is available for the FZ6R. If I remember correctly, it's more of a cover that goes over the back half of the XJ6 banana seat.
Edited to add: This is directly from the description on the website. So yeah, no go with the FZ6R.
Yamaha XJ6 / XJ6 Diversion 2009-2012 Ermax Seat Cowl
The seat cover is manuafactured from automotive grade ABS plastic, easy to fit and remove. It is supplied with any required fixings and finished in factory colours (or unpainted).
The Ermax Single seat cover is an easy to fit accessory that gives your bike that factory look.
The Single seat cover slips over the rear seat pad itself and is secured when seat is locked in place as normal.
Made from ABS automotive quality plastic, the Single seat cover is available in a wide range of factory matched colours along with base plastic ready for those custom paint jobs!!